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VOLUME 122 (2025) | ISSUE 2 | PAGE 100
NMR evidence for a pseudogap in Pb-doped Bi:2201 single crystal
DOI: 10.31857/S0370274X25070144
Abstract
A 63Cu nuclear magnetic resonance (NMR) study of a Pb-doped Bi:2201 system, Bi1.6Pb0.4Sr2.05CuOy, is presented. The temperature dependencies of the NMR peak shift and the nuclear spin-lattice relaxation (SLR) rate reveal the pseudogap that opens near T^{\ast}=60 K, significantly above the superconducting critical temperature T_c\simeq9 K at the NMR experiment field, 7 T oriented H\parallel c. The noticeable disparity between Tc and T^{\ast} and the behavior of Cu SLR at T>T^{\ast} imply the underdoped state of the studied system. A relatively weak effect of the magnetic field on the superconductivity evidenced from small (\approx 7 K) shift of the zero-field T_{c0}=16\pm 1 K under the applied 7 T field suggests high upper critical field, Hc2, unusual for compounds with as low Tc0.